Fracturing well site system

ABSTRACT

A fracturing system includes a plurality of electrical apparatuses, a plurality of fuel-driven apparatuses and a grounding system. The grounding system includes a first grounding metal wire, a second grounding metal wire, and a first grounding terminal. The first grounding terminal is spaced from each of the electrical apparatus and the electric-power supply apparatus by one or more distances. Each of the plurality of electrical apparatuses is connected to the first grounding metal wire and is connected to the first grounding terminal through the first grounding metal wire. Each of the plurality of fuel-driven apparatuses is connected to the second grounding metal wire and is connected to the first grounding terminal through the second grounding metal wire. The first grounding metal wire and the second grounding metal wire are connected to the first grounding terminal in parallel.

CROSS-REFERENCE OF RELATED APPLICATIONS

The present application is a continuation of U.S. patent applicationSer. No. 17/869,336 filed on Jul. 20, 2022, entitled “FRACTURING WELLSITE SYSTEM,” which is a continuation application of U.S. patentapplication Ser. No. 17/325,955 filed on May 20, 2021, entitled“FRACTURING WELL SITE SYSTEM,” which claims priority of the ChineseUtility Model Application No. 202120706298.3 filed on Apr. 7, 2021. Allof the above-referenced applications are hereby incorporated byreference in their entirety.

TECHNICAL FIELD

Embodiments of the disclosure relate to a fracturing well site system.

BACKGROUND

Fracturing refers to a method of forming fractures in undergroundoil-gas layer by hydraulic action in the process of exploiting oil andgas, and is also known as hydraulic fracturing. With the exploitation ofshale gas in recent years, large-scale fracturing operation hasgradually developed and adopted. Most of the fracturing operations arebased on a diesel-driven apparatus, and the diesel-driven apparatus hasthe disadvantages of low power density, high noise and largeenvironmental pollution. In view of the above problems, a well siteoperation system is developed, in which an electric-driven apparatus ismainly used and the diesel-driven apparatus severs as an auxiliaryapparatus. The electric-driven apparatus uses the power supplied fromelectric-power supply apparatus, and the electric-power supply apparatusoften is an electric motor, which has high power density, low noise andno waste pollution. However, the well site using the electric-drivenapparatus uses high-voltage electricity as the power, accidents such asfire and explosion caused by electric shock may occur.

SUMMARY

Embodiments of the disclosure provides a fracturing well site system,comprising an electric-driven apparatus, a fuel-driven apparatus, anelectric-power supply apparatus and a grounding system. The groundingsystem comprises a first grounding terminal which is spaced from each ofthe electric-driven apparatus, the fuel-driven apparatus and theelectric-power supply apparatus by a preset distance. The fuel-drivenapparatus and at least one of the electric-driven apparatus and theelectric-power supply apparatus are connected to the first groundingterminal, and the first grounding terminal is configured to ground thefuel-driven apparatus and the at least one of the electric-drivenapparatus and the electric-power supply apparatus.

In at least some embodiments, the electric-driven apparatus and thefuel-driven apparatus are connected to the first grounding terminal; thefracturing well site system comprises a plurality of electric-drivenapparatuses and a plurality of fuel-driven apparatuses; the groundingsystem further comprises a first grounding wire and a second groundingwire; each of the plurality of electric-driven apparatuses is connectedto the first grounding wire and is connected to the first groundingterminal through the first grounding wire; each of the plurality offuel-driven apparatuses is connected to the second grounding wire and isconnected to the first grounding terminal through the second groundingwire.

In at least some embodiments, the fuel-driven apparatus and theelectric-power supply apparatus are connected to the first groundingterminal; the electric-power supply apparatus comprises anelectric-power supply device, an electric-power converter deviceelectrically connected with the electric-power supply device, and anelectric-power distribution device electrically connected with theelectric-power converter device; the fuel-driven apparatus and at leastone of the electric-power supply device, the electric-power converterdevice and the electric-power distribution device are connected to thefirst grounding terminal.

In at least some embodiments, the fracturing well site system comprisesa plurality of fuel-driven apparatuses; the grounding system comprises asecond grounding wire and a third grounding wire; each of the pluralityof fuel-driven apparatuses is connected to the second grounding wire andis connected to the first grounding terminal through the secondgrounding wire; the at least one of the electric-power supply device,the electric-power converter device and the electric-power distributiondevice is connected to the third grounding wire and is connected to thefirst grounding terminal through the third grounding wire.

In at least some embodiments, the third grounding wire is configured tosurround the at least one of the electric-power supply device, theelectric-power converter device and the electric-power distributiondevice, and a planar shape of the third grounding wire is a closed loop.

In at least some embodiments, all of the electric-driven apparatus, thefuel-driven apparatus and the electric-power supply apparatus areconnected to the first grounding terminal; the fracturing well sitesystem comprises a plurality of electric-driven apparatuses and aplurality of fuel-driven apparatuses; the electric-power supplyapparatus comprises an electric-power supply device, an electric-powerconverter device electrically connected with the electric-power supplydevice and an electric-power distribution device electrically connectedwith the electric-power converter device; the grounding system comprisesa first grounding wire, a second grounding wire and a third groundingwire; each of the plurality of electric-driven apparatuses is connectedto the first grounding wire and is connected to the first groundingterminal through the first grounding wire; each of the plurality offuel-driven apparatuses is connected to the second grounding wire and isconnected to the first grounding terminal through the second groundingwire; at least one of the electric-power supply device, theelectric-power converter device and the electric-power distributiondevice is connected to the third grounding wire and is connected to thefirst grounding terminal through the third grounding wire.

In at least some embodiments, the grounding system further comprises asecond grounding terminal, and the second grounding terminal is directlyconnected with at least one of the electric-driven apparatus, thefuel-driven apparatus and the electric-power supply apparatus and isconfigured to ground the at least one of the electric-driven apparatus,the fuel-driven apparatus and the electric-power supply apparatus.

In at least some embodiments, the third grounding wire is configured tosurround the at least one of the electric-power supply device, theelectric-power converter device and the electric-power distributiondevice, and a planar shape of the third grounding wire is a closed loop.

In at least some embodiments, the plurality of electric-drivenapparatuses are provided in at least two rows spaced apart from eachother in a first direction, each row comprises at least twoelectric-driven apparatuses provided in a second direction, and thefirst direction and the second direction are perpendicular to eachother; the plurality of the fuel-driven apparatuses are provided in atleast two rows spaced apart from each other in the first direction, eachrow comprises at least two fuel-driven apparatuses provided in thesecond direction; the first grounding wire is located between the atleast two rows of electric-driven apparatuses in the first direction;the second grounding wire is located between the at least two rows offuel-driven apparatuses in the first direction; the first groundingterminal is located between the first grounding wire and the secondgrounding wire in the second direction.

In at least some embodiments, the first grounding wire, the secondgrounding wire and the third grounding wire are provided on the groundand comprise a flat-shaped portion made from a conductive material.

In at least some embodiments, the fracturing well site system furthercomprises an auxiliary electric-driven apparatus which is connected tothe first grounding terminal, and the first grounding terminal isfurther configured to ground the auxiliary electric-driven apparatus.

In at least some embodiments, the fracturing well site system furthercomprises an overhead cable, the overhead cable is connected with theelectric-power supply apparatus and configured to provide power to theelectric-power supply apparatus; the overhead cable comprises aconductive core and a protective layer wrapping the conductive core, andthe protective layer comprises a shielding layer; the grounding systemfurther comprises a third grounding terminal, the third groundingterminal is connected with the shielding layer of the overhead cable andconfigured to ground the shielding layer of the overhead cable.

In at least some embodiments, the electric-driven apparatus comprisesone or more of a frequency conversion apparatus, an electric-drivenfracturing apparatus, an electric-driven sand mixing apparatus, anelectric-driven sand transportation apparatus, an electric-driven meter,an electric-driven chemical additive apparatus and an electric-drivenproppant apparatus.

In at least some embodiments, the fuel-driven apparatus comprises adiesel-driven apparatus, and the diesel-driven apparatus comprises oneor more of a diesel-driven fracturing apparatus, a diesel-driven sandmixing apparatus and a diesel-driven mixing apparatus.

In at least some embodiments, the fracturing well site system furthercomprises a lightning protection apparatus, the lightning protectionapparatus comprises a main lightning protection apparatus which isprovided at a corner of the well site; the grounding system furthercomprises a fourth grounding terminal, the fourth grounding terminal isconnected with the main lightning protection apparatus and configured toground the main lightning protection apparatus; the fourth groundingterminal is not connected with the first grounding terminal.

In at least some embodiments, the lightning protection apparatus furthercomprises an auxiliary lightning protection apparatus provided on atleast one of the electric-driven apparatus, the fuel-driven apparatusand the electric-power supply apparatus; the auxiliary lightningprotection apparatus is grounded through a second grounding terminaldirectly connected with at least one of the electric-driven apparatus,the fuel-driven apparatus and the electric-power supply apparatus, and aheight of the auxiliary lightning protection apparatus relative to theground is lower than a height of the main lightning protection apparatusrelative to the ground.

In at least some embodiments, the first grounding terminal, a secondgrounding terminal, a third grounding terminal and a fourth groundingterminal are buried under the ground and made from a conductivematerial, and the conductive material is coated with an anti-corrosioncoating.

In at least some embodiments, the electric-power supply apparatuscomprises an electric-power supply device, the electric-power supplydevice comprises at least one of a first electric-power supply and asecond electric-power supply; the first electric-power supply isconfigured to provide a first voltage; the second electric-power supplyis configured to provide a second voltage; the first voltage and thesecond voltage are both in an order of kilovolts, and the first voltageis larger than the second voltage.

In at least some embodiments, the electric-power supply apparatusfurther comprises: an electric-power converter device electricallyconnected to the first electric-power supply; and an electric-powerdistribution device electrically connected to the electric-powerconverter device and configured to distribute power to theelectric-driven apparatus; the first electric-power supply is configuredto transmit the first voltage to the electric-power converter device;the electric-power converter device is configured to compare the firstvoltage with a preset voltage, adjust the first voltage according to acomparison result, and transmit the first voltage after being adjustedto the electric-power distribution device.

In at least some embodiments, the electric-power distribution device isdirectly electrically connected to the second electric-power supply, andthe electric-power distribution device is further configured todistribute the second voltage provided by the second electric-powersupply to the electric-driven apparatus.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to clearly illustrate the technical solution of the embodimentsof the disclosure, the drawings of the embodiments will be brieflydescribed in the following; it is obvious that the described drawingsare only related to some embodiments of the disclosure and thus are notlimitative of the disclosure.

FIG. 1 schematically illustrates a fracturing well site system accordingto embodiments of the present disclosure;

FIG. 2 schematically illustrates a ground system according to theembodiments of the present disclosure;

FIG. 3 schematically illustrates another grounding system according tothe embodiments of the present disclosure;

FIG. 4 schematically illustrates a third grounding wire of anelectric-power supply apparatus according to the embodiments of thepresent disclosure;

FIG. 5 schematically illustrates a grounding wire according to theembodiments of the present disclosure;

FIG. 6 is a cross-sectional view taken along a line BB of FIG. 5 ;

FIG. 7 is a cross-sectional view taken along a line AA of FIG. 5 ;

FIG. 8 schematically illustrates a connection relationship between anoverhead cable and the electric-power supply apparatus according to theembodiments of the present disclosure;

FIG. 9 schematically illustrates the overhead cable according to theembodiments of the present disclosure;

FIG. 10 schematically illustrates an exemplary structure of the overheadcable according to the embodiments of the present disclosure;

FIG. 11 schematically illustrates a first ground terminal according tothe embodiments of the present disclosure;

FIG. 12 is a cross-sectional view taken along a line CC of FIG. 11 ;

FIG. 13 schematically illustrates a connection relationship between theelectric-power supply apparatus and an electric-driven apparatusaccording to the embodiments of the present disclosure.

DETAILED DESCRIPTION

In order to make objects, technical details and advantages of theembodiments of the disclosure apparent, the technical solutions of theembodiments will be described in a clearly and fully understandable wayin connection with the drawings related to the embodiments of thedisclosure. Apparently, the described embodiments are just a part butnot all of the embodiments of the disclosure. Based on the describedembodiments herein, those skilled in the art can obtain otherembodiment(s), without any inventive work, which should be within thescope of the disclosure.

Unless otherwise defined, all the technical and scientific terms usedherein have the same meanings as commonly understood by one of ordinaryskill in the art to which the present disclosure belongs. The terms“first,” “second,” etc., which are used in the description and theclaims of the present disclosure, are not intended to indicate anysequence, amount or importance, but distinguish various components.Similarly, the terms “a,” or “an,” etc., do not mean a quantitativelimit, but the existence of at least one. The terms “comprises,”“comprising,” “includes,” “including,” etc., are intended to specifythat the elements or the objects stated before these terms encompass theelements or the objects and equivalents thereof listed after theseterms, but do not preclude the other elements or objects. The phrases“connect”, “connected”, etc., are not intended to define a physicalconnection or mechanical connection, but may include an electricalconnection, directly or indirectly. “On,” “under,” “right,” “left” andthe like are only used to indicate relative position relationship, andwhen the position of the object which is described is changed, therelative position relationship may be changed accordingly.

For example, in the electric-driven fracturing well site system, afuel-driven apparatus, an electric-driven apparatus and anelectric-power supply apparatus are respectively grounded through theirown grounding devices to avoid electric shock to person and damage toapparatus and wires. However, many electrical apparatuses are providedin the electric-driven fracturing well site, the electrical apparatusesbeing grounded one by one is not only troublesome to operate, but alsohas potential safety problem when the grounding of the electricalapparatus is at a position close to the electrical apparatus itself.

The embodiments of the disclosure provide a fracturing well site system,the fracturing well site system includes an electric-driven apparatus, afuel-driven apparatus, an electric-power supply apparatus, and agrounding system. The grounding system includes a first groundingterminal, and the first grounding terminal is spaced from each of theelectric-driven apparatus, the fuel-driven apparatus and theelectric-power supply apparatus by a preset distance. The fuel-drivenapparatus and at least one of the electric-driven apparatus and theelectric-power supply apparatus are connected to the first groundingterminal, and the first grounding terminal is configured to ground thefuel-driven apparatus and the at least one of the electric-drivenapparatus and the electric-power supply apparatus.

In the fracturing well site system according to the embodiments of thepresent disclosure, by connecting the fuel-driven apparatus and at leastone of the electric-driven apparatus and the electric-power supplyapparatus to the first grounding terminal, the total number of groundingterminals are reduced, and the workload of grounding operation isreduced. Furthermore, by arranging the first grounding terminal at thepreset distance from each of the electric-driven apparatus, thefuel-driven apparatus and the electric-power supply apparatus, leakagecurrent, static charge and the like possibly generated by the aboveapparatuses are introduced to a position far away from the aboveapparatuses, thereby further improving the safety of the groundingsystem and ensuring the normal operation of each apparatus in the wellsite.

In the embodiments of the present disclosure, connecting the fuel-drivenapparatus and at least one of the electric-driven apparatus and theelectric-power supply apparatus to the first grounding terminal meansthat: the fuel-driven apparatus and the at least one of theelectric-driven apparatus and the electric-power supply apparatus areconnected to the same first grounding terminal. For example, it includesthe following three cases: 1) the electric-driven apparatus and thefuel-driven apparatus are connected to the same first groundingterminal; 2) the electric-power supply apparatus and the fuel-drivenapparatus are connected to the same first grounding terminal; 3) theelectric-driven apparatus, the electric-power supply apparatus and thefuel-driven apparatus are all connected to the same first groundingterminal. Please refer to the following detailed description of thethree cases.

In the embodiments of the disclosure, the “preset distance” refers tothe distance satisfying the safety requirements of the fracturing wellsite system. For example, the first grounding terminal is provided at aposition, of the fracturing well site, far away from electric-drivenapparatus, the fuel-driven apparatus and the electric-power supplyapparatus, for example, is provided at an edge of the well site. Forexample, the distance from the first grounding terminal to theelectric-driven apparatus is a first distance, the distance from thefirst grounding terminal to the fuel-driven apparatus is a seconddistance, the distance from the first grounding terminal to theelectric-power supply apparatus is a third distance, and each of thefirst distance, the second distance and the third distance is greaterthan or equal to the preset distance.

Generally, the earth has a relatively large resistivity, and differentpositions of the earth have different potentials if a current flowsthrough the earth. After the current flows into the earth through thegrounding terminal, the current spreads from the ground position in aform of current field; the farther away from the grounding position is,the larger the hemispherical current spreading area is, and the smallerthe current density in the earth is. Therefore, it is considered thatthe current density in the earth is close to zero at a position far awayfrom the grounding position, and the potential is already a zeropotential at the position far away from the grounding position. Becauseeach of the first distance, the second distance and the third distanceis greater than or equal to the preset distance, the leakage current andstatic charge which are possibly generated by the electric-drivenapparatus, the fuel-driven apparatus or the electric-power supplyapparatus are led to the remote position of the well site, therebyfurther improving the safety of the grounding system and ensuring thenormal operation of each apparatus in the well site. For example, thepreset distance is set to be 50 m 5 km; further, for example, 100 m to 1km.

The disclosure will be explained by several specific examples asfollows. In order to keep the following description of the embodimentsof the present disclosure clearer and more concise, detaileddescriptions of known functions and known components may be omitted.When any component of the embodiments of the present disclosure isillustrated in more than one drawing, the component is denoted by thesame reference numeral in each drawing.

FIG. 1 schematically illustrates the fracturing well site systemaccording to the embodiments of the present disclosure. As shown in FIG.1 , the fracturing well site system includes a plurality ofelectric-driven apparatuses 1, a plurality of fuel-driven apparatuses 2,an electric-power supply apparatus 3, and a grounding system. Forexample, the grounding system includes a first grounding terminal G1,which is spaced from each of the electric-driven apparatuses 1, thefuel-driven apparatuses 2 and the electric-power supply apparatus 3 by apreset distance. The electric-driven apparatuses 1, the fuel-drivenapparatuses 2 and the electric-power supply apparatus 3 for example areall connected to the same first grounding terminal G1.

The electric-driven apparatuses 1, the fuel-driven apparatuses 2 and theelectric-power supply apparatus 3 are all connected to the same firstgrounding terminal G1, which not only reduces the total number of thegrounding terminals and the workload of the grounding operation, butalso leads the leakage current and static charge possibly generated bythe electric-driven apparatuses 1, the fuel-driven apparatuses 2 and theelectric-power supply apparatus 3 to the remote position of the wellsite, thereby further ensuring the normal operation of each apparatus inthe well site.

FIG. 1 illustrates only the case 3) described above. It can beunderstood that in the embodiments of the present disclosure (referringto FIG. 2 and FIG. 3 ), the electric-driven apparatuses 1, thefuel-driven apparatuses 2 and the electric-power supply apparatus 3adopt the grounding manners in cases 1) and 2).

FIG. 2 schematically illustrates the grounding system according to theembodiments of the present disclosure. For example, as shown in FIG. 2 ,the fracturing well site system includes the plurality ofelectric-driven apparatuses 1, the plurality of fuel-driven apparatuses2, the electric-power supply apparatus 3 and the grounding system. Thegrounding system includes the first grounding terminal G1. The pluralityof electric-driven apparatuses 1 and the plurality of fuel-drivenapparatuses 2 are connected to the same first grounding terminal G1.That is to say, the plurality of electric-driven apparatuses 1 and theplurality of fuel-driven apparatuses 2 share the same first groundingterminal G1, which reduces the total number of the grounding terminalsused in the well site.

As shown in FIG. 2 , the grounding system further includes a firstgrounding wire GL1 and a second grounding wire GL2. Each of theplurality of electric-driven apparatuses 1 is connected to the firstgrounding wire GL1 and is connected to the first grounding terminal G1through the first grounding wire GL1. Each of the plurality offuel-driven apparatuses 2 is connected to the second grounding wire GL2and is connected to the first grounding terminal G1 through the secondgrounding wire GL2. In FIG. 2 , by separating the first grounding wireGL1 connected to the electric-driven apparatuses 1 from the secondgrounding wire GL2 connected to the fuel-driven apparatuses 2, mutualinterference between the electric-driven apparatuses 1 and thefuel-driven apparatuses 2 in a fault state is avoided, and the groundingsystem is more stable. For example, in the case that the first groundingwire GL1 connected with the electric-driven apparatuses 1 breaks downand causes electric leakage, the grounding of the fuel-drivenapparatuses 2 is not affected, thereby ensuring the normal operation ofthe fuel-driven apparatuses 2.

FIG. 3 schematically illustrates another grounding system according tothe embodiments of the present disclosure. For example, as shown in FIG.3 , the fracturing well site system includes the plurality ofelectric-driven apparatuses 1, the plurality of fuel-driven apparatuses2, the electric-power supply apparatus 3 and the grounding system. Thegrounding system includes the first grounding terminal G1, and theplurality of fuel-driven apparatuses 2 and the electric-power supplyapparatuses 3 are connected to the same first grounding terminal G1. Forexample, the electric-power supply apparatus 3 includes anelectric-power supply device 31, an electric-power converter device 32electrically connected to the electric-power supply device 31, and anelectric-power distribution device 33 electrically connected to theelectric-power converter device 32. Each of the electric-power supplydevice 31, the electric-power converter device 32, and theelectric-power distribution device 33 and each of the plurality offuel-driven apparatuses 2 are connected to the same first groundingterminal G1. That is, each of the electric-power supply device 31, theelectric-power converter device 32 and the electric-power distributiondevice 33 and each of the fuel-driven apparatuses 2 share the same firstgrounding terminal G1, which reduces the total number of the groundingterminals, thereby reducing the difficulty and complexity of thegrounding operation.

In FIG. 3 , each of the electric-power supply device 31, theelectric-power converter device 32, and the electric-power distributiondevice 33 is connected to the first grounding terminal G1. It can beunderstood that in other embodiments of the present disclosure, at leastone of the electric-power supply device 31, the electric-power converterdevice 32 and the electric-power distribution device 33 is connected tothe first grounding terminal G1; alternatively, at least two of theelectric-power supply device 31, the electric-power converter device 32and the electric-power distribution device 33 are connected to the firstgrounding terminal G1. In the case that each of the electric-powersupply device 31, the electric-power converter device 32, and theelectric-power distribution device 33 is connected to the firstgrounding terminal G1, the safety of the whole electric-power supplyapparatus is further improved, and thus such case is preferable.

As shown in FIG. 3 , the grounding system further includes the secondgrounding wire GL2 and a third grounding wire GL3. Each of the pluralityof fuel-driven apparatuses 2 is connected to the second grounding wireGL2 and is connected to the first grounding terminal G1 through thesecond grounding wire GL2. Each of the electric-power supply device 31,the electric-power converter device 32 and the electric-powerdistribution device 33 is connected to the third grounding wire GL3 andis connected to the first grounding terminal G1 through the thirdgrounding wire GL3.

In FIG. 3 , each of the electric-power supply device 31, theelectric-power converter device 32 and the electric-power distributiondevice 33 is connected to the first grounding terminal G1 through thethird grounding wire GL3. It can be understood that in other embodimentsof the disclosure, at least one of the electric-power supply device 31,the electric-power converter device 32 and the electric-powerdistribution device 33 is connected to the first grounding terminal G1through the third grounding wire GL3; alternatively, at least two of theelectric-power supply device 31, the electric-power converter device 32and the electric-power distribution device 33 are connected to the firstgrounding terminal G1 through the third grounding wire GL3, so as toachieve the above purpose of the disclosure. In the case that each ofthe electric-power supply device 31, the electric-power converter device32 and the electric-power distribution device 33 is connected to thefirst grounding terminal G1 through the third grounding wire GL3, whenany one of the electric-power supply device 31, the electric-powerconverter device 32 and the electric-power distribution device 33 breaksdown (e.g., leaks current), adverse interference to the other twoapparatuses is avoided, thereby ensuring the normal operation of theother two apparatuses, and thus such case is preferable.

In the fracturing well site system shown in FIG. 3 , the third groundingwire GL3 connected to the electric-power supply apparatus 3 and thesecond grounding wire GL2 connected to the fuel-driven apparatuses 2 areseparated from each other, so that mutual interference between theelectric-power supply apparatus 3 and the fuel-driven apparatuses 2 in afault state is avoided, and the grounding system is more stable. Forexample, in the case that the third grounding wire GL3 connected to theelectric-power supply apparatus 3 breaks down and causes currentlyleakage, the grounding of the fuel-driven apparatuses 2 are notaffected, thereby ensuring the normal operation of the fuel-drivenapparatuses 2.

In at least some embodiments, for example, the third grounding wire isconfigured to surround at least one of the electric-power supply device,the electric-power converter device and the electric-power distributiondevice, which enhances the grounding protection of the electric-powersupply apparatus. For example, the third grounding wire is configured tosurround one of the electric-power supply device, the electric-powerconverter device and the electric-power distribution device, and theother two devices are located outside a region surrounded by the thirdgrounding wire. The fracturing well site usually uses voltage in theorder of kilovolts, in this case, by arrange the grounding wire surroundat least one of the electric-power supply apparatus, the electric-powerconverter device and the electric-power distribution device, the leakagecurrent, the static charge or the lightning current which possiblyproduced by the devices are led into the ground, and person near thedevices is prevented from getting the electric shock, thereby furtherimproving the safety of electric-power supply apparatus.

Further, for example, a planar shape of the third grounding wire is anon-closed shape or a closed shape, such as a closed loop shape. Theplanar shape of the third grounding wire is the closed loop, so that theleakage current, the static charge or the lightning current whichpossibly generated in all directions around the device are led into theground, and thereby further improving the safety of electric-powersupply apparatus. In the embodiments of the present disclosure, theclosed loop for example has any shape, such as a regular shape or anirregular shape. Examples of closed loop include, but are not limitedto, rectangle, circle, triangle, oval, polygon and the like, which arenot specifically limited by the embodiments of the present disclosure.

In at least some embodiments, the third grounding wire is configured tosurround at least two of the electric-power supply device, theelectric-power converter device and the electric-power distributiondevice. FIG. 4 schematically illustrates the third grounding wireconnected to the electric-power supply apparatus according to theembodiments of the present disclosure. For example, as shown in FIG. 4 ,the third grounding wire GL3 surrounds the electric-power converterdevice 32 and the electric-power distribution device 33 to form theclosed loop. The electric-power converter device 32 and theelectric-power distribution device 33 are connected to the firstgrounding terminal G1 through the third grounding wire GL3. Theelectric-power supply device 31 is located outside the region surroundedby the closed loop and adopts a separate grounding terminal. In thiscase, the third grounding wire GL3 surrounds the electric-powerconverter device 32 and the electric-power distribution device 33, sothat the leakage current, the static charge, the lightning current andthe like, which possibly generated by the electric-power converterdevice 32 and the electric-power distribution device 33, are introducedinto the ground to further improve the safety of electric-power supplyapparatus. In addition, the electric-power converter device 32 and theelectric-power distribution device 33 are connected to the same thirdgrounding wire GL3, the total number of the grounding wires are reduced,and the workload of the well site operation is reduced. Furthermore, theelectric-power supply device 31 uses the grounding terminal differentfrom the grounding terminal G1 used by the electric-power converterdevice 32 and the electric-power distribution device 33, so thatgrounding interference between the electric-power supply device 31 andeach of the electric-power converter device 32 and the electric-powerdistribution device 33 is avoided.

In at least some embodiments, the third grounding wire is configured tosurround the three devices, that is, the electric-power supply device,the electric-power converter device and the electric-power distributiondevice. For example, as shown in FIG. 1 , the third grounding wire GL3extends along a periphery of the electric-power supply device 31, theelectric-power converter device 32, and the electric-power distributiondevice 33 to form the closed loop. The third grounding wire GL3 isconnected to the first grounding terminal G1. Because the thirdgrounding wire GL3 surrounds all the electric-power supply device 31,the electric-power converter device 32 and the electric-powerdistribution device 33, the leakage current, the static charge or thelightning current, which possibly generated in all directions by thesethree devices, are introduced into the ground, and the safety ofelectric-power supply apparatus is further improved. In addition,because the electric-power supply device 31, the electric-powerconverter device 32 and the electric-power distribution device 33 areconnected to the same third grounding wire GL3 and the same groundingterminal G1, the total number of the grounding wires and groundingterminals are reduced, and the workload of well site operation isreduced.

Returning to FIG. 1 , the fracturing well site system includes theplurality of electric-driven apparatuses 1, the plurality of fuel-drivenapparatuses 2 and the electric-power supply apparatus 3. Theelectric-power supply apparatus 3 includes the electric-power supplydevice 31, the electric-power converter device 32 electrically connectedto the electric-power supply device 31, and the electric-powerdistribution device 33 electrically connected to the electric-powerconverter device 32. The grounding system includes the first groundingwire GL1, the second grounding wire GL2, and the third grounding wireGL3. Each of the electric-driven apparatuses 1 is connected to the firstgrounding wire GL1 and is connected to the first grounding terminal G1through the first grounding wire GL1. Each of the fuel-drivenapparatuses 2 is connected to the second grounding wire GL2 and isconnected to the first grounding terminal G1 through the secondgrounding wire GL2. The electric-power supply device 31, theelectric-power converter device 32, and the electric-power distributiondevice 33 are connected to the third grounding wire GL3 and areconnected to the first grounding terminal G1 through the third groundingwire GL3. Compared with the case where each apparatus is connected toits own grounding terminal, the fracturing well site system according tothe embodiments of the disclosure includes the first grounding wire GL1,the second grounding wire GL2 and the third grounding wire GL3, on onehand, the total number of the grounding terminals are reduced and theworkload of the grounding operation is reduced; on the other hand, ifone of the grounding wires fails due to breakage, the grounding effectof other grounding wires are not affected, thereby ensuring the normaloperation of the plurality of apparatuses connected with other groundingwires.

For example, as shown in FIG. 1 , the grounding system further includesa plurality of second grounding terminals G2. The plurality of secondgrounding terminals G2 are directly connected with the electric-drivenapparatus 1, the fuel-driven apparatus 2 and the electric-power supplyapparatus 3, respectively, and are configured to ground each of theelectric-driven apparatus 1, the fuel-driven apparatus 2 and theelectric-power supply apparatus 3. For example, taking theelectric-driven apparatus 1 as an example, the electric-driven apparatus1 is provided with a connection wire CL1. For example, a proximal end ofthe connection wire CL1 is fixedly connected with the electric-drivenapparatus 1, and a distal end of the connection wire CL1 is connectedwith the second grounding terminal G2. The second grounding terminal G2for example is buried under the ground around the electric-drivenapparatus 1 to realize grounding. Through the connection wire CL1, theleakage current or static charge generated by the electric-drivenapparatus 1 is led to the second grounding terminal G2. In this way, theelectric-driven apparatus 1 is grounded not only through the firstgrounding terminal G1, but also through the second grounding terminalG2, so that double grounding protection of the electric-driven apparatus1 is achieved, which further improves the safety and reliability of theelectric-driven apparatus 1. Similarly, the fuel-driven apparatus 2 forexample is connected to the second grounding terminal G2 through aconnection wire CL2. Each of the electric-power supply device 31, theelectric-power converter device 32, and the electric-power distributiondevice 33 of the electric-power supply apparatus 3 is connected to thethird grounding terminal G3 through a connection wire CL3.

In the embodiments of the present disclosure, the electric-drivenapparatus 1, the fuel-driven apparatus 2 and the electric-power supplyapparatus 3 for example adopt a skid-mounted mode or a trailer mode; anddifferent modes may result in that the connection mode between theapparatus and the second grounding terminal is various. For example,taking the electric-driven apparatus 1 as an example, theelectric-driven apparatus 1 for example adopts the skid-mounted mode andis fixed on a base of the skid-mounted frame, at this time, the proximalend of the connection wire CL1 is connected to the base of theskid-mounted frame, and the distal end of the connection wire CL1 isconnected to the second grounding terminal G2. For example, theelectric-driven apparatus 1 adopts the trailer mode, the electric-drivenapparatus 1 is movable at any time, at this time, the proximal end ofthe connection wire CL1 is directly connected to a housing of theelectric-driven apparatus 1, and the distal end of the connection wireCL1 is connected to the second grounding terminal G2. Those skilled inthe art may select one of the above two connection modes according toactual needs, which is not limited by the embodiments of the presentdisclosure.

In FIG. 1 , each of the electric-driven apparatus 1, the fuel-drivenapparatus 2, the electric-power supply device 31, the electric-powerconverter device 32 and the electric-power distribution device 33 isconnected with the corresponding second grounding terminal G2. It can beunderstood that in other embodiments of the present disclosure, one ormore apparatuses among the above apparatuses are selected to beconnected with the second grounding terminal according to actual needs.The embodiments of the present disclosure do not limit the total numberof the apparatuses that are connected with the second grounding terminalG2.

With continued reference to FIG. 1 , for example, the plurality ofelectric-driven apparatuses 1 are provided in two rows spaced apart fromeach other in a first direction X (i.e. upper and lower rows ofelectric-driven apparatuses shown in the figure). Each row ofelectric-driven apparatuses includes at least two electric-drivenapparatuses 1, and the at least two electric-driven apparatuses 1 areprovided in the second direction Y. The first direction X and the seconddirection Y are perpendicular to each other. For example, the pluralityof fuel-driven apparatuses 2 are provided in two rows spaced apart fromeach other in the first direction X (i.e. upper and lower rows offuel-driven apparatuses shown in the figure). Each row of fuel-drivenapparatuses includes at least two fuel-driven apparatuses 2 provided inthe second direction Y.

For example, the first grounding wire GL1 is located between the tworows of electric-driven apparatuses in the first direction X. Forexample, the second grounding wire GL2 is located between the two rowsof fuel-driven apparatuses in the first direction X. For example, thefirst grounding terminal G1 is located between the first grounding wireGL1 and the second grounding wire GL2 in the second direction Y. Byadopting the above layout of the apparatuses and grounding wires, on onehand, the first grounding wire GL1 and the second grounding wire GL2don't cross each other, thereby avoiding the interference between thetwo grounding wires; on the other hand, an amount of the material forforming the grounding wires is reduced, which reduces the cost of thegrounding system of the well site system on the premise of ensuringsafety, and improves the space occupancy of the well site system.

In FIG. 1 , the plurality of electric-driven apparatuses are provided intwo rows and the plurality of fuel-driven apparatuses are provided intwo rows; it can be understood that in other embodiments of the presentdisclosure, the plurality of electric-driven apparatuses or theplurality of fuel-driven apparatuses for example are provided in tworows or more than two rows, which is not limited by the embodiments ofthe present disclosure.

In addition, the embodiments of the present disclosure do not limit thetype of the apparatus in each row. For example, taking electric-drivenapparatus as an example, each row of electric-driven apparatus forexample includes the same kind of electric-driven apparatus (such as anelectric-driven fracturing apparatus), or different kinds ofelectric-driven apparatus (such as the combination of theelectric-driven fracturing apparatus and a frequency conversionapparatus and the like).

In the embodiments of the disclosure, the electric-driven apparatusincludes one or more of a frequency conversion apparatus, anelectric-driven fracturing apparatus, an electric-driven sand mixingapparatus, an electric-driven sand transportation apparatus, anelectric-driven meter, an electric-driven chemical additive apparatusand an electric-driven proppant apparatus. For example, the fuel-drivenapparatus includes the apparatus driven by fuel, including but notlimited to a diesel-driven apparatus. For example, the diesel-drivenapparatus includes one or more of a diesel-driven fracturing apparatus,a diesel-driven sand mixing apparatus and a diesel-driven mixingapparatus.

In at least some embodiments, each of the first grounding wire GL1, thesecond grounding wire GL2, and the third grounding wire GL3 comprises aplurality of portions. The following description will take the firstgrounding wire GL1 as an example.

For example, as shown in FIG. 1 , the first grounding wire GL1 includesa first portion S1, a second portion S2, and a third portion S3. Thefirst portion S1 and the third portion S3 are provided opposite to eachother in the first direction X. The second portion S2 is located betweenfirst portion S1 and third portion S3 in the first direction X. Forexample, the first portion S1, the second portion S2 and the thirdportion S3 form a U-shape. In the case where the electric-drivenapparatuses 1 are provided in two rows, one row of electric-drivenapparatuses (for example, the upper row of electric-driven apparatusesshown in the figure) is connected to the first portion S1, the other rowof electric-driven apparatuses (for example, the lower row ofelectric-driven apparatuses shown in the figure) is connected to thethird portion S3, and the second portion S2 is connected to the firstgrounding terminal G1. In the case that the upper row of electric-drivenapparatuses are connected to the first portion S1 and the lower row ofelectric-driven apparatuses are connected to the third portion S3, ifone of the first portion S1 and the third portion S3, such as the firstportion S1, fails due to the wire breakage, the grounding effect of thethird portion S3 is not affected, thereby ensuring the grounding safetyof the lower row of electric-driven apparatuses.

In at least some embodiments, the third grounding wire GL3 is directlyconnected with the first grounding terminal G1, or is connected with thefirst grounding terminal G1 through other grounding wire. For example,as shown in FIG. 1 , the electric-power supply apparatus 3 is disposedon a side of the first grounding wire GL1 away from the second groundingwire GL2, and the third grounding wire GL3 is connected with the firstgrounding terminal G1 through the first grounding wire GL1. Further, forexample, the third grounding wire GL3 is connected to two ends of thefirst grounding wire GL1, that is, a first end E1 and a second end E2 ofthe first grounding wire GL1. By adopting the above arrangement, aconnection wire from the third grounding wire GL3 to the first groundingterminal G1 is omitted, the amount of the material for forming thegrounding wire is reduced, and the cost of the grounding system of thewell site is reduced on the premise of ensuring safety.

In at least some embodiments, for example, each of the first groundingwire GL1, the second grounding wire GL2, and the third grounding wireGL3 is disposed on the ground has a flat-shaped portion made from aconductive material. For example, each of the first grounding wire GL1,the second grounding wire GL2, and the third grounding wire GL3 which ismade of the conductive material is wrapped by an insulating material.The following description will take the first grounding wire GL1 as anexample.

FIG. 5 schematically illustrates the grounding wire according to theembodiments of the present disclosure. FIG. 6 is a cross-sectional viewtaken along the line BB of FIG. 5 . FIG. 7 is a cross-sectional viewtaken along the line AA of FIG. 5 .

For example, as shown in FIGS. 5 to 7 , the first grounding wire GL1includes a plurality of flat-shaped portions. For example, each of thefirst portion S1, the second portion S2 and the third portion S3comprises a piece of flat-shaped steel, and the plurality of pieces offlat-shaped steel are connected with each other by welding or fastenersF. The fastener F for example is a galvanized bolt. The flat-shapedportion is made from the conductive material such as a metal material.In order to reduce the resistance of the grounding system, theflat-shaped portion is preferably made from flat-shaped galvanized steelor flat-shaped galvanized iron. The cross section of the flat-shapedportion is, for example, rectangular. Considering that the flat-shapedportion should bear a short-circuit current for a certain time in ashort-circuit state, a width of the flat-shaped portion is, for example,from 30 mm to 50 mm, preferably 40 mm. A thickness of the flat-shapedportion is from 3 mm to 5 mm, preferably 4 mm.

Returning to FIG. 1 , the first grounding wire GL1 and the secondgrounding wire GL2 for example are connected to the first groundingterminal G1 through a connection wire CL4. In the embodiments of thepresent disclosure, for example, each of the connection wires CL1, CL2,CL3, CL4 includes an equipotential connection wire. Equipotentialconnection equalizes potential and reduce contact voltage by proving theequipotential connection wire without adding protective appliances toeliminate the risk of electric shock caused by potential difference, andthe equipotential connection is economical and effectively preventselectric shock. For example, the equipotential connection wire includesa metal-core cable, such as a copper-core cable. For example, a diameterof the equipotential connection wire is from 5 mm to 15 mm, preferably10 mm.

For example, as shown in FIG. 1 , the fracturing well site systemfurther includes an auxiliary electric-driven apparatus 5, which isconnected to the first grounding terminal G1, and the first groundingterminal G1 is further configured to ground the auxiliaryelectric-driven apparatus 5. The auxiliary electric-driven apparatus 5includes other electric power consumption apparatus used in the wellsite, such as a lighting apparatus and a water pump. By connecting theauxiliary electric-driven apparatus 5 to the first grounding terminal G1in the well site, it is unnecessary to separately provide a groundingterminal for the auxiliary electric-driven apparatus 5, thereby reducingthe total number of the grounding terminals used in the well site andreducing the workload of the grounding operation.

FIG. 8 schematically illustrates a connection relationship between anoverhead cable and the electric-power supply apparatus according to theembodiments of the present disclosure. FIG. 9 schematically illustratesthe overhead cable according to the embodiments of the presentdisclosure. FIG. 10 schematically illustrates an exemplary structure ofthe overhead cable according to the embodiments of the presentdisclosure.

For example, as shown in FIGS. 8 to 10 , the fracturing well site systemfurther includes an overhead cable 8, the overhead cable 8 is connectedwith the electric-power supply apparatus 3 and configured to supplypower to the electric-power supply apparatus 3. The overhead cable 8includes a conductive core 81 and a protective layer 82 wrapping theconductive core 81. For example, the protective layer 82 includes ashielding layer 91 close to the conductive core 81 and an insulatinglayer 92 far away from the conductive core 81. For example, theshielding layer 91 prevents the conductive core 81 from radiatingelectromagnetic energy outwardly and reduces the influence of anexternal electric field or magnetic field on the conductive wire core81. For example, the shielding layer 91 comprises a metal mesh.

As shown in FIG. 9 , the grounding system further includes a thirdgrounding terminal G3, the third grounding terminal G3 is connected tothe shielding layer 91 of the overhead cable 8 and configured to groundthe shielding layer 91 of the overhead cable 8. The above-mentionedthird grounding terminal G3 is spaced apart from the first groundingterminal G1 and the second grounding terminal G2, that is, the firstgrounding terminal G1, the second grounding terminal G2 and the thirdgrounding terminal G3 are not connected with each other; in this way, inthe case that one of the three grounding terminal fails, the groundingeffect of other grounding terminals is not affected, and the normaloperation of the apparatus or device connected to other groundingterminals is ensured.

Returning to FIG. 1 , the fracturing well site system further includes alightning protection apparatus 6, the lightning protection apparatus 6includes a main lightning protection apparatus 61, and the mainlightning protection apparatus 61 is provided at a corner of the wellsite. As shown in FIG. 1 , the main lightning protection apparatus 61 isprovided at each of four corners of the well site. The main lightningprotection apparatus 61 is preferably a lightning receptor apparatus forpreventing direct lightning. The main lightning protection apparatus hasan individual grounding component. For example, the grounding systemincludes a fourth grounding terminal G4 connected with the mainlightning protection apparatus 61 and configured to ground the mainlightning protection apparatus 61, and the fourth grounding terminal G4is not connected with the first grounding terminal G1. Under lightningstrikes, a current flows through the main lightning protection apparatus61; in this case, because the main lightning protection apparatus 61 hasthe individual grounding terminal, other grounding terminals orgrounding apparatuses are not affected.

In at least some embodiments, the lightning protection apparatus furthercomprises an auxiliary lightning protection apparatus provided on atleast one of the electric-driven apparatus, the fuel-driven apparatusand the electric-power supply apparatus. For example, as shown in FIG. 1, the auxiliary lightning protection apparatus 62 is mounted on each ofthe electric-driven apparatuses 1, and the auxiliary lightningprotection apparatus 63 is mounted on each of the fuel-drivenapparatuses 2. Each of the auxiliary lightning protection apparatuses62, 63 for example includes one or more of the “TM-CPD (CountcurrentProtective Device)”, the lightning receptor apparatus and the surgeprotector. Different from the normal way of introducing the lightningcurrent to the earth for lightning protection, the TM-CPD adopts the wayof “upper neutralization and lower blocking”, which prevents lightningfrom entering downwardly into the protection area to be protected, sothat direct lightning does not fall into the area to be protected. Thetechnical advantages of the TM-CPD are as follows: 1) the directlightning does not fall into the area to be protected, and the TM-CPD isnot the device of leading the direct lightning to the earth; 2) noelectric-power is needed and no secondary problems are generated; 3) thegrounding resistance is low, which is not more than 30Ω (ohm), forexample the grounding resistance is 4Ω.

In FIG. 1 , only the electric-driven apparatus 1 and the fuel-drivenapparatus 2 are provided with the auxiliary lightning protectionapparatus 62 and 63; it can be understood that the auxiliary lightningprotection apparatus for example is also mounted on each of theelectric-power supply device 31, the electric-power converter device 32and the electric-power distribution device 33, and the embodiments ofthe present disclosure do not limit the arrangement mode of theauxiliary lightning protection apparatus.

As shown in FIG. 1 , the auxiliary lightning protection apparatus 62 isgrounded through the second grounding terminal G2 directly connected tothe electric-driven apparatus 1. That is, the auxiliary lightningprotection apparatus 62 and the electric-driven apparatus 1 areconnected to the same second grounding terminal G2. Because theauxiliary lightning protection apparatus 62 does not need a separategrounding terminal, the total number of the grounding terminals isreduced, and the workload of the grounding operation is reduced.Similarly, the auxiliary lightning protection apparatus 63 and thefuel-driven apparatus 2 are connected to the same second groundingterminal G2.

In at least some embodiments, a height of the auxiliary lightningprotection apparatuses 62, 63 relative to the ground is lower than aheight of the main lightning protection apparatus 61 relative to theground. When the lightning strikes, due to the higher height of the mainlightning protection apparatus 61, the current generated by lightning isfirstly introduced into the ground through the main lightning protectionapparatus 61, thereby avoiding the impact of lightning on the auxiliarylightning protection apparatuses 62 and 63.

In the embodiments of the present disclosure, the first groundingterminal G1, the second grounding terminal G2, the third groundingterminal G3 and the fourth grounding terminal G4 are buried under theground and made from the conductive material, and the conductivematerial is coated with an anti-corrosion coating. The followingdescription will take the first grounding terminal G1 as an example.

FIG. 11 schematically illustrates the first grounding terminal accordingto the embodiments of the present disclosure. FIG. 12 is across-sectional view taken along the CC line of FIG. 11 .

For example, as shown in FIG. 11 , the first grounding terminal G1includes a grounding body 10 buried under the ground G. For example, thegrounding body 10 adopts a 50 mm×50 mm×5 mm angle steel and is buriedunder the ground G in the vertical direction. The embodiments of thepresent disclosure do not specifically limit the total number of thegrounding bodies 10, for example, the total number of the groundingbodies 10 is one or more. In the case that the grounding resistance doesnot meet the requirements of the well site, the total number of thegrounding bodies are increased to reduce the resistance of the groundingresistance. For example, three grounding bodies 10 are provided at anequal interval. For example, a distance between any two adjacentgrounding bodies 10 is equal to or greater than twice of a length ofeach of the grounding bodies 10. For example, the length of thegrounding body 10 is 1.5 m, and the distance P between two adjacentgrounding bodies 10 is 4 m-6 m, preferably 5 m. The buried depth of thetop surface of grounding body (i.e. a distance from the ground G to thetop surface of grounding body) should meet the design requirements. Forexample, the buried depth L of the top surface of the grounding body 10is equal to or greater than 0.6 m, for example, 0.6 m to 1.2 m.

For example, as shown in FIG. 12 , in order to prevent the surface ofthe grounding body 10 from being corroded, the surface of the groundingbody 10 needs to undergo anti-corrosion treatment, for example, thesurface of the grounding body 10 is coated with the anti-corrosioncoating 11.

FIG. 13 schematically illustrates a connection relationship between theelectric-power supply apparatus and the electric-driven apparatusaccording to the embodiments of the present disclosure. For example, asshown in FIG. 13 , the electric-power supply apparatus 3 includes theelectric-power supply device 31, the electric-power converter device 32,and the electric-power distribution device 33. The electric-power supplydevice 31 includes a first electric-power supply P1 and a secondelectric-power supply P2. The first electric-power supply P1 isconfigured to provide a first voltage; the second electric-power supplyP2 is configured to provide a second voltage. For example, both thefirst voltage and the second voltage are in the order of kilovolts, andthe first voltage is higher than the second voltage. In actualproduction, the first voltage is not lower than 35 kv, and the secondvoltage is not lower than 10 kv.

In the embodiments of the present disclosure, the first electric-powersupply P1 and the second electric-power supply P2 for example areconnected to an external electric-power supply apparatus (such as theoverhead cable); alternatively, the first electric-power supply P1 andthe second electric-power supply P2 are a local electric-generatorsystem or an electric-storage apparatus. The electric-generator forexample is a gas turbine electric-generator or a dieselelectric-generator. The electric-storage apparatus for example comprisesa super-capacitor or other electric-storage elements.

As shown in FIG. 13 , the first electric-power supply P1 is configuredto transmit the first voltage to the electric-power converter device 32.The electric-power converter device 32 is electrically connected to thefirst electric-power supply P1. The electric-power converter device 32is configured to compare the first voltage with a preset voltage, adjustthe first voltage according to the comparison result, and transmit thefirst voltage after being adjusted to the electric-power distributiondevice 33. The electric-power distribution device 33 is electricallyconnected to the electric-power converter device 32 and is configured todistribute the electric-power to the plurality of electric-drivenapparatuses 1.

For example, the first voltage provided by the first electric-powersupply P1 is 35 kv and the power is 5 MVA. After the first voltage isinput to the electric-power converter device 32, the electric-powerconverter device 32 compares the first voltage with the preset voltage(e.g., 10 kv). Because the first voltage is higher than the presetvoltage, the electric-power converter device 32 converts the firstvoltage into 10 kv voltage, so that the high-voltage side voltage of theelectric-power converter device 32 is 35 kv, the low-voltage sidevoltage of the electric-power converter device 32 is 10 kv, and thepower is not less than 5 MVA. Subsequently, the electric-power converterdevice 32 transmits the first voltage after being adjusted to theelectric-power distribution device 33. The electric-power distributiondevice 33 distributes the 10 kv voltage to the electric-driven apparatusat the well site. For example, the electric-power distribution device 33adopts the mode of one input wire in combination with multiple outputwires, and the power of each output wire is not less than 3 MVA.

As shown in FIG. 13 , the electric-power distribution device 33 isfurther directly electrically connected to the second electric-powersupply P2. The electric-power distribution device 33 is furtherconfigured to distribute the second voltage provided by the secondelectric-power supply P2 to the plurality of electric-driven apparatuses1. For example, the second voltage provided by the second electric-powersupply P2 is 10 kv; in this case, the second voltage is not needed to beconverted before being input to the second electric-power supply P2,thereby reducing the total number of the electric-power converterdevices.

In FIG. 13 , it is shown that the electric-power supply device 31includes the first electric-power supply P1 and the secondelectric-power supply P2; it can be understood that in other embodimentsof the present disclosure, the electric-power supply device 31 forexample only includes the first electric-power supply P1 or the secondelectric-power supply P2. In addition, the respective numbers of thefirst electric-power supply P1 and the second electric-power supply P2are not limited to one, but may be two or more, which are selected bythose skilled in the art according to actual requirements, and theembodiments of the present disclosure do not limit this.

Without conflict, various embodiments of the present disclosure andfeatures in the embodiments can be combined with each other to obtainnew embodiments.

The various components or structures in the drawings are not strictlydrawn to actual scale, and the sizes of the various components orstructures may be exaggerated or reduced for the sake of clarity, butthese should not be used to limit the scope of the disclosure.

The foregoing embodiments merely are exemplary embodiments of thedisclosure, and not intended to define the scope of the disclosure, andthe scope of the disclosure is determined by the appended claims.

What is claimed is:
 1. A fracturing system, comprising a plurality ofelectrical apparatuses, a plurality of fuel-driven apparatuses and agrounding system, wherein: the grounding system comprises a firstgrounding metal wire, a second grounding metal wire, and a firstgrounding terminal, the first grounding terminal being spaced from eachof the electrical apparatus and the electric-power supply apparatus byone or more distances; each of the plurality of electrical apparatusesis connected to the first grounding metal wire and is connected to thefirst grounding terminal through the first grounding metal wire; each ofthe plurality of fuel-driven apparatuses is connected to the secondgrounding metal wire and is connected to the first grounding terminalthrough the second grounding metal wire; and the first grounding metalwire and the second grounding metal wire are connected to the firstgrounding terminal in parallel.
 2. The fracturing system according toclaim 1, wherein the one or more distances are 50 m to 5 km.
 3. Thefracturing system according to claim 1, further comprising anelectric-power supply apparatus, wherein the electric-power supplyapparatus is connected to the first grounding terminal.
 4. Thefracturing system according to claim 3, wherein: the electric-powersupply apparatus comprises an electric-power supply device, anelectric-power converter device electrically connected with theelectric-power supply device, and an electric-power distribution deviceelectrically connected with the electric-power converter device; thegrounding system further comprises a third grounding metal wire; and atleast one of the electric-power supply device, the electric-powerconverter device, and the electric-power distribution device isconnected to the third grounding metal wire and is connected to thefirst grounding terminal through the third grounding metal wire.
 5. Thefracturing system according to claim 4, wherein: the third groundingmetal wire is configured to surround at least one of the electric-powersupply device, the electric-power converter device, or theelectric-power distribution device; and the third grounding metal wireis a closed wire loop.
 6. The fracturing system according to claim 4,wherein the first grounding metal wire is connected between the thirdgrounding metal wire and the first grounding terminal; and at least oneof the electric-power supply device, the electric-power converterdevice, and the electric-power distribution device is connected to thethird grounding metal wire and is connected to the first groundingterminal through the third grounding metal wire and the first groundingmetal wire.
 7. The fracturing system according to claim 6, wherein: allof the electrical apparatus and the electric-power supply apparatus areconnected to the first grounding terminal.
 8. The fracturing systemaccording to claim 7, wherein: the third grounding metal wire isconfigured to surround the electric-power supply device, theelectric-power converter device, and the electric-power distributiondevice; and the third grounding metal wire is a closed wire loop.
 9. Thefracturing system according to claim 1, wherein: the plurality ofelectrical apparatuses are disposed in at least two rows spaced apartfrom each other in a first direction; each of the at least two rowscomprises at least two electrical apparatuses provided in a seconddirection; the first direction and the second direction areperpendicular to each other; the plurality of fuel-driven apparatusesare disposed in at least two rows spaced apart from each other in thefirst direction; and each of the at least two rows of fuel-drivenapparatuses comprises at least two fuel-driven apparatuses provided inthe second direction.
 10. The fracturing system according to claim 9,wherein: the first grounding metal wire is located between the at leasttwo rows of electrical apparatuses; the second grounding metal wire islocated between the at least two rows of fuel-driven apparatuses; andthe first grounding terminal is located between the first groundingmetal wire and the second grounding metal wire.
 11. The fracturingsystem according to claim 4, wherein: the first grounding wire, thesecond grounding wire, and the third grounding wire are provided on aground level and comprise a flat-shaped structure of conductivematerial.
 12. The fracturing system according to claim 1, wherein: thegrounding system further comprises a plurality of second groundingterminal, and each of the second grounding terminals is directlyconnected with a respective one of the electrical apparatuses and isconfigured to ground the respective one of the electrical apparatuses.13. The fracturing system according to claim 1, wherein: the fracturingsystem further comprises an auxiliary electrical apparatus connected tothe first grounding terminal; and the first grounding terminal isfurther configured to ground the auxiliary electrical apparatus.
 14. Thefracturing system according to claim 3, wherein: the fracturing systemfurther comprises an overhead cable; the overhead cable is connectedwith the electric-power supply apparatus and configured to provide powerto the electric-power supply apparatus; and the overhead cable comprisesa conductive core and a protective layer wrapping the conductive core.15. The fracturing system according to claim 14, wherein: the protectivelayer comprises a shielding layer; the grounding system furthercomprises a third grounding terminal; and the third grounding terminalis connected with the shielding layer of the overhead cable andconfigured to ground the shielding layer of the overhead cable.
 16. Thefracturing system according to claim 1, wherein: the electricalapparatuses comprise two or more of a frequency conversion apparatus, anelectrical fracturing apparatus, an electrical sand mixing apparatus, anelectrical sand transportation apparatus, an electrical meter, anelectrical chemical additive apparatus, and an electrical proppantapparatus.
 17. The fracturing system according to claim 1, comprising afuel-driven apparatus, wherein: the fuel-driven apparatus comprises twoor more of a diesel-driven fracturing apparatus, a diesel-driven sandmixing apparatus, and a diesel-driven mixing apparatus.
 18. Thefracturing system according to claim 3, wherein: the electric-powersupply apparatus comprises an electric-power supply device; theelectric-power supply device comprises at least one of a firstelectric-power supply and a second electric-power supply; the firstelectric-power supply is configured to provide a first voltage; thesecond electric-power supply is configured to provide a second voltage;the first voltage and the second voltage are both in an order ofkilovolts; and the first voltage is larger than the second voltage. 19.The fracturing system according to claim 18, wherein: the electric-powersupply apparatus further comprises an electric-power converter deviceelectrically connected to the first electric-power supply; theelectric-power supply apparatus further comprises an electric-powerdistribution device electrically connected to the electric-powerconverter device and configured to distribute power to the electricalapparatus; the first electric-power supply is configured to transmit thefirst voltage to the electric-power converter device; and theelectric-power converter device is configured to compare the firstvoltage with a preset voltage, adjust the first voltage according to acomparison result, and transmit the adjusted first voltage to theelectric-power distribution device.
 20. The fracturing system accordingto claim 19, wherein: the electric-power distribution device is directlyelectrically connected to the second electric-power supply; and theelectric-power distribution device is further configured to distributethe second voltage provided by the second electric-power supply to theelectrical apparatus.